The LG Optimus 2X (P990) can be upgraded to Android 4.2.1 (Jelly Bean) with a CyanogenMod 10.1 (CM10.1) custom ROM. Though, the device is old, the development team has managed to port the ROM, keeping it up to date.

Those who wish to install the ROM in Optimus 2X (P990) can check the tutorial below. IBTimes UK will not be held responsible for any damage to the device during installation.

Note: This is a nightly build, ensure that you know after installing this ROM, your device may get FC errors, boot loops and a few other bugs. Also, the device may not reboot. But you can fix this by reinstalling stock firmware or any other stable custom ROM.